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Old Dec 12, 2015, 07:05 AM
mick666 is offline
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Carbon tube spar - 3m glider

Hello

I'm looking to build a replacement centre section panel for a CircleDancer 3000. It is a one piece centre section with plug in tip panels.. Its a built up wing based around a 10mm carbon spar. Don't have the original centre
section.

I can source carbon tubes but my question is ... should I use a pultruded carbon or woven fabric carbon tube?

To give you an idea of the model ... there are photos on hyperflights site. There is an electric version also ... but i'm guessing they are the same build.

http://www.hyperflight.co.uk/product...e=CDG-3000-RES

http://www.hyperflight.co.uk/product...ode=CD-3000-FH

Cheers

Mike
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Old Dec 12, 2015, 10:31 AM
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Quote:
Originally Posted by mick666 View Post
... should I use a pultruded carbon or woven fabric carbon tube?
Either one will be more than adequate for that kind of a plane. Woven will give you a little more torsional stiffness, but I doubt you will ever get into a situation where you would notice the difference. If the tip panel joiners plug into the spar tube, woven one will be more resistant to splitting - or you could wrap the tips of a pultruded tube with kevlar thread, dental floss or something.

In summary: if you have a convinient source of woven fabric tube (please share, if you do), go ahead and use it. If not, pultruded will do the job just fine.
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Old Dec 12, 2015, 12:46 PM
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'... convenient source of woven fabric tubes...'

http://seta-tech.de/themes/kategorie...?kategorieid=6
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Old Dec 13, 2015, 03:13 AM
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For me pultruded are a joke if not filled with anything light and solid enough to not them ovalise at effort and finally crack.
Broke two 10 mm tubes so far, in planes even smaller than 2 meters, just flying, not hard landings ! They crack even if pressed with two fingers !
But when filled with 8mm balsa round rod, the things change, a lot !
If they are used as joiners, wrapping pultruded with kevlar is mandatory.
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